US2025204227A1PendingUtilityA1
Display apparatus
Est. expiryDec 19, 2043(~17.4 yrs left)· nominal 20-yr term from priority
H10K 50/856H10K 59/878H10K 59/1213H10K 59/131H10K 59/8051H10K 59/879H10K 59/80518H10K 59/351H10K 59/8791H10K 59/123
53
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Claims
Abstract
A display apparatus for improving a light extraction efficiency of light emitted from a light emitting layer is provided. The display apparatus includes a plurality of pixels having a plurality of subpixels on a substrate, a pattern portion disposed on the substrate to be concave in a non-light emission area between the plurality of sub-pixels, and a reflective portion disposed to be inclined on the pattern portion. Each of the plurality of sub-pixels includes a plurality of concave portions disposed in a light emission area adjacent to the non-light emission area, and a pixel electrode disposed on the plurality of concave portions. A separation distance between the plurality of concave portions and the reflective portion is longer than a separation distance between the pixel electrode and the reflective portion.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A display apparatus comprising:
a plurality of pixels having a plurality of subpixels on a substrate, wherein the substrate includes a light emission area and a non-light emission area adjacent to the light emission area; a pattern portion disposed on the substrate to be concave in the non-light emission area between the plurality of subpixels; and a reflective portion disposed to be inclined on the pattern portion, wherein each of the plurality of sub-pixels includes:
a plurality of concave portions disposed in the light emission area; and
a pixel electrode disposed on the plurality of concave portions, and
wherein a separation distance between the plurality of concave portions and the reflective portion is longer than a separation distance between the pixel electrode and the reflective portion.
2 . The display apparatus of claim 1 , wherein an outermost concave portion of the plurality of concave portions is spaced apart from an edge of the pixel electrode.
3 . The display apparatus of claim 1 , wherein
the plurality of subpixels include an overcoat layer including a first layer and a second layer on the first layer, the first layer including the plurality of concave portions, the first layer includes a flat surface disposed in parallel with the substrate, and the flat surface is disposed to be closer to the substrate than the plurality of concave portions.
4 . The display apparatus of claim 1 , wherein the pattern portion is spaced apart from the light emission area.
5 . The display apparatus of claim 1 , wherein a width of the pattern portion decreases in a direction from the reflective portion toward the substrate.
6 . The display apparatus of claim 3 , wherein
the first layer includes an inclined surface connecting the flat surface and the plurality of concave portions, the flat surface of the first layer and the inclined surface of the first layer are connected at a first point, and the first point is disposed to overlap the pixel electrode.
7 . The display apparatus of claim 6 , wherein the plurality of subpixels include:
an organic light emitting layer in the light emission area and the non-light emission area; and a reflective electrode on the organic light emitting layer, and wherein the reflective portion is a portion of the reflective electrode.
8 . The display apparatus of claim 7 , wherein
the reflective portion includes a lower surface contacting the organic light emitting layer, the lower surface of the reflective portion includes a second point disposed on the pattern portion, and the second point is an inflection point at which the reflective electrode is inflected in the pattern portion.
9 . The display apparatus of claim 8 , wherein
an upper surface of the reflective portion includes a third point disposed at a lowermost side on the pattern portion, the non-light emission area includes a first area between an edge of the pixel electrode and the second point, and a second area between the second point and the third point, the second area being adjacent to the first area, and the reflective portion is disposed in the second area.
10 . The display apparatus of claim 9 , wherein
a horizontal distance PHL between the second point and the first point is provided to satisfy a following expression:
PHL
=
h
*
tan
(
2
a
)
,
wherein h represents a thickness of the second layer disposed on the flat surface of the first layer, and a represents an angle between the reflective portion and the flat surface of the first layer.
11 . The display apparatus of claim 10 , wherein the plurality of concave portions are spaced apart from the reflective portion by a distance greater than the horizontal distance.
12 . The display apparatus of claim 10 , further comprising:
a plurality of data lines configured to supply data signals to the plurality of subpixels, wherein the plurality of data lines are disposed to overlap the first area.
13 . The display apparatus of claim 1 , wherein
the plurality of subpixels include an organic light emitting layer in the light emission area and the non-light emission area, wherein a refracted light corresponds to a light emitted from the organic light emitting layer that is incident on any one of the plurality of concave portions at a first angle from a direction perpendicular to the lower surface of the pixel electrode, and is refracted by at least one concave portion to reach the reflective portion, an intensity of the refracted light I(θ max ) is provided to satisfy a following expression:
I (θ max )=∫ 0 Φ 0 I 0 T P (θ max ,Φ) dΦ
wherein Φ 0 is a maximum angle at which light incident at the first angle is transmitted to a side surface of the concave portion without being totally reflected in an interior of the concave portion, I 0 is an intensity of light incident on the concave portion, and T P is a light transmittance at a point on the concave portion, θ max is the first angle, Φ is a second angle between a virtual line VL and the upper surface of the concave portion, where the virtual line VL connects a center of the concave portion and the point of the concave portion through which light incident on the concave portion is transmitted.
14 . The display apparatus of claim 13 , wherein
the plurality of subpixels are disposed on the substrate and include an overcoat layer including a first layer including the plurality of concave portions and a second layer on the first layer, the maximum angle Φ 0 is provided to satisfy a following expression:
Φ
0
=
a
tan
(
-
AR
/
tan
(
θ
max
-
a
sin
(
N
)
)
)
wherein AR is an aspect ratio of one concave portion of the plurality of concave portions, θ max is the first angle, and N is a ratio of a refractive index of the first layer with respect to a refractive index of the second layer.
15 . The display apparatus of claim 13 , wherein
the light transmittance T P of the point of the concave portion is provided to satisfy a following expression:
T
P
=
1
-
(
❘
"\[LeftBracketingBar]"
sin
θ
1
-
N
sin
θ
2
sin
θ
1
+
N
sin
θ
2
❘
"\[RightBracketingBar]"
2
+
❘
"\[LeftBracketingBar]"
N
sin
θ
1
-
sin
θ
2
N
sin
θ
1
+
sin
θ
2
❘
"\[RightBracketingBar]"
2
)
wherein θ 1 is an angle of incidence of light incident on the concave portion, θ 2 is a refractive index of light transmitting through the concave portion, and N is a ratio of the refractive index of the first layer with respect to the refractive index of the second layer.
16 . The display apparatus of claim 15 , wherein
the angle of incidence θ 1 is an angle between a normal to a tangent of the point of the concave portion and the light incident into the concave portion, the angle of incidence θ 1 is provided to satisfy a following expression:
θ
1
=
π
/
2
-
m
-
θ
max
wherein π is a constant, and m is a slope of the tangent of the point of the concave portion.
17 . The display apparatus of claim 16 , wherein
the angle of refraction θ 2 is an angle between the light transmitting through the concave portion and the normal, the angle of refraction θ 2 is provided to satisfy a following expression:
θ 2 =a sin( N sin(θ 1 )).
18 . The display apparatus of claim 16 , wherein
the slope m is provided to satisfy a following expression:
m
=
❘
"\[LeftBracketingBar]"
atan
(
-
cos
Φ
sin
Φ
AR
)
❘
"\[RightBracketingBar]"
wherein AR is an aspect ratio of one concave portion of the plurality of concave portions.
19 . The display apparatus of claim 14 , wherein the first angle is a maximum angle at which light emitted by the organic light emitting layer passes through the pixel electrode to be incident on the second layer.
20 . The display apparatus of claim 14 , wherein when the aspect ratio of the concave portion is greater than or equal to 1.0, the intensity of the refracted light is greater than or equal to about 90% of the maximum intensity of the refracted light.
21 . The display apparatus of claim 1 , further comprising a plurality of data lines configured to supply data signals to the plurality of subpixels,
wherein the plurality of data lines are disposed to be extended in a second direction intersecting a first direction between the plurality of subpixels disposed in the first direction, and the pattern portion partially overlaps the plurality of data lines in the first direction and the second direction.
22 . The display apparatus of claim 1 , wherein
the plurality of subpixels include a first subpixel, a second subpixel, a third subpixel, and a fourth subpixel disposed sequentially in a first direction, the substrate includes a reference line extended in a second direction intersecting the first direction between the second subpixel and the third subpixel, and at least a portion of the reference line overlaps the pattern portion.
23 . The display apparatus of claim 1 , wherein the pattern portion is disposed along a shape of the pixel electrode.
24 . The display apparatus of claim 1 , further comprising:
a plurality of thin film transistors to drive the plurality of subpixels, wherein the substrate includes a connecting area in which the plurality of thin film transistors and the pixel electrode are connected, and the pattern portion is not disposed in the connecting area.
25 . The display apparatus of claim 1 , further comprising a plurality of data lines configured to supply data signals to the plurality of subpixels,
wherein the plurality of data lines are disposed to extend in a second direction intersecting a first direction between the plurality of subpixels disposed in the first direction, the pattern portion includes a first pattern line extended in the first direction and a second pattern line extended in the second direction, and the second pattern line does not overlap the data line in the second direction.
26 . The display apparatus of claim 25 , the first pattern line is disposed between the subpixels for emitting light of the same color, and the second pattern line is disposed between the subpixels for emitting light of different colors.Join the waitlist — get patent alerts
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